Treat cache writes as best-effort after a successful database query. Keep database errors authoritative and cover both paths with a failing store.
Fixes#1154
BREAKING CHANGE: The original Go module name was `github.com/ArtalkJS/Artalk`, which has now been modified to `github.com/artalkjs/artalk/v2` (all lowercase). This change may affect the CI pipeline or other areas if you are compiling the Artalk server and have specified the fixed Go module name. Regarding the original `-ldflags -X github.com/ArtalkJS/Artalk/internal/config.Version` and `CommitHash` definitions, please remove them, as they are now obsolete. The `Version` has been hardcoded into the Go code, and the `CommitHash` is now read from the Go build info via runtime/debug’s vcs.revision value. This change only affects the server developers and does not impact the frontend UI client.
* feat: garbage collection feature
A new `GC()` method has been added to the `Cache` struct,
which performs garbage collection by deleting expired entries from the
cache.